European Journal of Applied Physiology

, Volume 110, Issue 5, pp 1083–1089

Skin blood flow differentially affects near-infrared spectroscopy-derived measures of muscle oxygen saturation and blood volume at rest and during dynamic leg exercise

Original Article

Abstract

The impact of skin blood flow changes on near-infrared spectroscopy (NIRS)-derived measures of muscle oxygen saturation (SmO2) and blood volume has not been fully established. We measured SmO2 and total hemoglobin concentration ([tHb]) responses of the right vastus lateralis during rest and dynamic knee extension exercise in ten young, healthy males. The protocol was repeated four times: twice without thigh heating for reliability, and twice with different grades of thigh heating for assessing the impact of cutaneous vasodilation on SmO2 and Δ[tHb]. The reliability of our SmO2 and [tHb] measurements was good. Thigh heating at 37 and 42°C caused marked increases in cutaneous vascular conductance (CVC) during rest and exercise (P < 0.001 between each condition), and small increases in SmO2 during rest (from 69 ± 8% to 71 ± 7% and 73 ± 6%, respectively; P < 0.05 between each condition), but not during exercise (e.g. 1 min exercise: 51 ± 11% vs. 51 ± 11% and 52 ± 11%, respectively; P > 0.05 at all time points). In contrast, heating-induced increases in %CVCpeak were accompanied by increases in [tHb] at rest and during exercise and a decrease in Δ[tHb] during exercise (all P < 0.05). Our findings suggest that NIRS-derived measures of SmO2 and blood volume are differentially affected by skin blood flow at rest and during exercise. The findings from this study should be considered in NIRS experiments where skin blood flow can change markedly (e.g. high-intensity and/or prolonged exercise).

Keywords

Near-infrared spectroscopy Skin blood flow Exercise Laser Doppler flowmetry Muscle oxygen saturation 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Garry A. Tew
    • 1
  • Alan D. Ruddock
    • 1
  • John M. Saxton
    • 1
    • 2
  1. 1.Centre for Sport and Exercise Science, Collegiate Crescent CampusSheffield Hallam UniversitySheffieldUK
  2. 2.School of Allied Health Professions, Faculty of HealthUniversity of East AngliaNorwichUK

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